diff --git a/arch/arm/dts/ast2500-evb.dts b/arch/arm/dts/ast2500-evb.dts
index 4796ed445f..c6b7675902 100644
--- a/arch/arm/dts/ast2500-evb.dts
+++ b/arch/arm/dts/ast2500-evb.dts
@@ -73,3 +73,36 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sd2_default>;
 };
+
+&fmc {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_fwspics1_default>;
+
+	flash@0 {
+		status = "okay";
+		spi-max-frequency = <50000000>;
+		spi-tx-bus-width = <2>;
+		spi-rx-bus-width = <2>;
+	};
+
+	flash@1 {
+		status = "okay";
+		spi-max-frequency = <50000000>;
+		spi-tx-bus-width = <2>;
+		spi-rx-bus-width = <2>;
+	};
+};
+
+&spi1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_spi1cs1_default>;
+
+	flash@0 {
+		status = "okay";
+		spi-max-frequency = <50000000>;
+		spi-tx-bus-width = <2>;
+		spi-rx-bus-width = <2>;
+	};
+};
diff --git a/arch/arm/dts/ast2500.dtsi b/arch/arm/dts/ast2500.dtsi
index ee66ef6704..d78a53aeb7 100644
--- a/arch/arm/dts/ast2500.dtsi
+++ b/arch/arm/dts/ast2500.dtsi
@@ -57,23 +57,26 @@
 		ranges;
 
 		fmc: flash-controller@1e620000 {
-			reg = < 0x1e620000 0xc4
-				0x20000000 0x10000000 >;
+			reg = <0x1e620000 0xc4>, <0x20000000 0x10000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2500-fmc";
+			clocks = <&scu ASPEED_CLK_AHB>;
+			num-cs = <3>;
 			status = "disabled";
-			interrupts = <19>;
+
 			flash@0 {
 				reg = < 0 >;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
 				reg = < 1 >;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@2 {
 				reg = < 2 >;
 				compatible = "jedec,spi-nor";
@@ -82,17 +85,20 @@
 		};
 
 		spi1: flash-controller@1e630000 {
-			reg = < 0x1e630000 0xc4
-				0x30000000 0x08000000 >;
+			reg = <0x1e630000 0xc4>, <0x30000000 0x08000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2500-spi";
+			clocks = <&scu ASPEED_CLK_AHB>;
+			num-cs = <2>;
 			status = "disabled";
+
 			flash@0 {
 				reg = < 0 >;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
 				reg = < 1 >;
 				compatible = "jedec,spi-nor";
@@ -101,17 +107,20 @@
 		};
 
 		spi2: flash-controller@1e631000 {
-			reg = < 0x1e631000 0xc4
-				0x38000000 0x08000000 >;
+			reg = <0x1e631000 0xc4>, <0x38000000 0x08000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2500-spi";
+			clocks = <&scu ASPEED_CLK_AHB>;
+			num-cs = <2>;
 			status = "disabled";
+
 			flash@0 {
 				reg = < 0 >;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
 				reg = < 1 >;
 				compatible = "jedec,spi-nor";
diff --git a/arch/arm/dts/ast2600-evb.dts b/arch/arm/dts/ast2600-evb.dts
index 0d65054313..c1965e9093 100644
--- a/arch/arm/dts/ast2600-evb.dts
+++ b/arch/arm/dts/ast2600-evb.dts
@@ -72,12 +72,10 @@
 
 &fmc {
 	status = "okay";
-
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_fmcquad_default>;
 
 	flash@0 {
-		compatible = "spi-flash", "sst,w25q256";
 		status = "okay";
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <4>;
@@ -85,7 +83,6 @@
 	};
 
 	flash@1 {
-		compatible = "spi-flash", "sst,w25q256";
 		status = "okay";
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <4>;
@@ -93,7 +90,6 @@
 	};
 
 	flash@2 {
-		compatible = "spi-flash", "sst,w25q256";
 		status = "okay";
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <4>;
@@ -103,14 +99,12 @@
 
 &spi1 {
 	status = "okay";
-
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_spi1_default &pinctrl_spi1abr_default
 			&pinctrl_spi1cs1_default &pinctrl_spi1wp_default
 			&pinctrl_spi1wp_default &pinctrl_spi1quad_default>;
 
 	flash@0 {
-		compatible = "spi-flash", "sst,w25q256";
 		status = "okay";
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <4>;
@@ -120,13 +114,11 @@
 
 &spi2 {
 	status = "okay";
-
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_spi2_default &pinctrl_spi2cs1_default
 			&pinctrl_spi2cs2_default &pinctrl_spi2quad_default>;
 
 	flash@0 {
-		compatible = "spi-flash", "sst,w25q256";
 		status = "okay";
 		spi-max-frequency = <50000000>;
 		spi-tx-bus-width = <4>;
diff --git a/arch/arm/dts/ast2600.dtsi b/arch/arm/dts/ast2600.dtsi
index 64074309b7..dd36f55f20 100644
--- a/arch/arm/dts/ast2600.dtsi
+++ b/arch/arm/dts/ast2600.dtsi
@@ -129,74 +129,78 @@
 		};
 
 		fmc: flash-controller@1e620000 {
-			reg = < 0x1e620000 0xc4
-				0x20000000 0x10000000 >;
+			reg = <0x1e620000 0xc4>, <0x20000000 0x10000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2600-fmc";
 			status = "disabled";
-			interrupts = <GIC_SPI 39 IRQ_TYPE_LEVEL_HIGH>;
 			clocks = <&scu ASPEED_CLK_AHB>;
 			num-cs = <3>;
+
 			flash@0 {
-				reg = < 0 >;
+				reg = <0>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
-				reg = < 1 >;
+				reg = <1>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@2 {
-				reg = < 2 >;
+				reg = <2>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
 		};
 
 		spi1: flash-controller@1e630000 {
-			reg = < 0x1e630000 0xc4
-				0x30000000 0x08000000 >;
+			reg = <0x1e630000 0xc4>, <0x30000000 0x10000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2600-spi";
 			clocks = <&scu ASPEED_CLK_AHB>;
 			num-cs = <2>;
 			status = "disabled";
+
 			flash@0 {
-				reg = < 0 >;
+				reg = <0>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
-				reg = < 1 >;
+				reg = <1>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
 		};
 
 		spi2: flash-controller@1e631000 {
-			reg = < 0x1e631000 0xc4
-				0x50000000 0x08000000 >;
+			reg = <0x1e631000 0xc4>, <0x50000000 0x10000000>;
 			#address-cells = <1>;
 			#size-cells = <0>;
 			compatible = "aspeed,ast2600-spi";
 			clocks = <&scu ASPEED_CLK_AHB>;
 			num-cs = <3>;
 			status = "disabled";
+
 			flash@0 {
-				reg = < 0 >;
+				reg = <0>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@1 {
-				reg = < 1 >;
+				reg = <1>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
+
 			flash@2 {
-				reg = < 2 >;
+				reg = <2>;
 				compatible = "jedec,spi-nor";
 				status = "disabled";
 			};
